(~es)
1.
Sickness is the state of being ill or unhealthy.
In fifty-two years of working he had one week of ~...
There appears to be another outbreak of ~ among seals in the North Sea.
N-UNCOUNT
2.
Sickness is the uncomfortable feeling that you are going to vomit.
After a while, the ~ gradually passed and she struggled to the mirror.
= nausea
N-UNCOUNT
see also morning ~ , travel ~
3.
A ~ is a particular illness.
...radiation ~.
N-VAR